Dirt Bike Engine & Intake Parts

Dennis Kirk has all the parts you'll need to keep your dirt bike's engine running happily all season long. Whether you need pistons, a crankshaft bottom end kit or any other parts for your dirt or motocross bike, you'll find it on our site. With brands like Cylinder Works, Hot Cams and Hot Rods, you can be sure to get the performance and quality you seek.

Dennis Kirk carries full line of tuners from he likes of Dynojet and Moose, not to mention rad valves from Boyesen for more torque and increased horsepower. We also carry even more products like radiators, water pump covers and impeller kits and air cleaners to keep your bike running cooler and breathing more easily. Check out our selection of radiators from Fluidyne, our water pumps from Boysen and our air cleaners and filters from K & N.

If you're not sure which motocross engine is right for your bike, you can always reach out to our Technical Support team for assistance in finding the right product. The Technical Support team is available to help you. And with our free, same-day shipping on orders over $100, you'll have the parts you need in no time.Don't forget to check out our full Dirt bike Department when your done shopping for your Dirt Bike engine components.